I think (hope) it will be possible with the new 4.2 software for iPhone and iPad (later this week) to stream music to the Airport Express. Than the AE can be connected to the Beosound 8.
According to the manuel BS8 you can stream for sure from your Mac with the AE.
Jasper
Hello Jasper,
that would be fine if it works with Airplay and Airport Express without running ITunes on a PC!
So let´s wait and see until IOS 4.2 comes out probably this week....
/Räuber
